Robert,
i still take dynacirc cr -- nearly 3 years and counting. does it work? no idea. but it's been quite a while since i've had to adjust my meds - maybe 2 years? my progression is slow.
i plan to write to dr surmeier and tell him - plus let him know that I have had 4 spect scans and maybe they would be helpful to him even though i'm not in a controlled study.
jean